日了孝天犬了，刚刚看见我居然没有写心得六直接写了七，这不能容忍。所以我精心挑选一个很常使用的iOS小功能作为心得六的知识点（可以直接拷贝进去使用的demo）。经过几次构思，决定把地区时举器写一个。因为基本上做app都会有地址这一选项。而苹果手机90%都是用时举器去显示地址。现在进入正题。
首先，和往常一样，demo放在github上，地址：https://github.com/sunyunfei/AreaDemo.git
时举器 UIPickerView 是一个我不是经常用的控件。但是地址选择，日期显示基本上还是选择他的，不为别的，他省空间，显示形式比较好。它和表思路基本是一样的，两个代理UIPickerViewDelegate，UIPickerViewDataSource。我再说这个demo的基础是你已经学习过时举器，如果你还没有，那么请你看一下他的相关的资料。
首先我创建一个UIPickerView的视图。
.h
#import <UIKit/UIKit.h>
#import "AreaModel.h"
@interface AreaPickerView : UIView<UIPickerViewDelegate, UIPickerViewDataSource>
//取消按钮事件
- (IBAction)clickCancelBtn:(UIBarButtonItem *)sender;
//确定按钮事件
- (IBAction)clickOkBtn:(UIBarButtonItem *)sender;
//时举器
@property (weak, nonatomic) IBOutlet UIPickerView *areaPicker;
@property (strong, nonatomic) AreaModel *locate;
//选中块
@property(nonatomic,copy)void(^chooseBlock)(AreaPickerView *area);
//取消块
@property(nonatomic,copy)void(^cancelBlock)();
//确定块
@property(nonatomic,copy)void(^okBlock)();
- (id)initWithArea;
- (void)showInView:(UIView *)view;
- (void)cancelPicker;
@end
.m
#import "AreaPickerView.h"
@interface AreaPickerView()
{
NSArray *provinces, *cities, *areas;
}
@end
@implementation AreaPickerView
- (id)initWithArea
{
self = [[[NSBundle mainBundle] loadNibNamed:@"AreaPickerView" owner:self options:nil] objectAtIndex:0];
if (self) {
self.areaPicker.dataSource = self;
self.areaPicker.delegate = self;
//加载数据
provinces = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"area.plist" ofType:nil]];
cities = [[provinces objectAtIndex:0] objectForKey:@"cities"];
self.locate.state = [[provinces objectAtIndex:0] objectForKey:@"state"];
self.locate.city = [[cities objectAtIndex:0] objectForKey:@"city"];
areas = [[cities objectAtIndex:0] objectForKey:@"areas"];
if (areas.count > 0) {
self.locate.district = [areas objectAtIndex:0];
} else{
self.locate.district = @"";
}
}
return self;
}
-(AreaModel *)locate
{
if (_locate == nil) {
_locate = [[AreaModel alloc] init];
}
return _locate;
}
#pragma mark - PickerView lifecycle
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 3;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
switch (component) {
case 0:
return [provinces count];
break;
case 1:
return [cities count];
break;
case 2:
return [areas count];
break;
default:
return 0;
break;
}
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
switch (component) {
case 0:
return [[provinces objectAtIndex:row] objectForKey:@"state"];
break;
case 1:
return [[cities objectAtIndex:row] objectForKey:@"city"];
break;
case 2:
if ([areas count] > 0) {
return [areas objectAtIndex:row];
break;
}
default:
return @"";
break;
}
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
switch (component) {
case 0:
cities = [[provinces objectAtIndex:row] objectForKey:@"cities"];
[self.areaPicker selectRow:0 inComponent:1 animated:YES];
[self.areaPicker reloadComponent:1];
areas = [[cities objectAtIndex:0] objectForKey:@"areas"];
[self.areaPicker selectRow:0 inComponent:2 animated:YES];
[self.areaPicker reloadComponent:2];
self.locate.state = [[provinces objectAtIndex:row] objectForKey:@"state"];
self.locate.city = [[cities objectAtIndex:0] objectForKey:@"city"];
if ([areas count] > 0) {
self.locate.district = [areas objectAtIndex:0];
} else{
self.locate.district = @"";
}
break;
case 1:
areas = [[cities objectAtIndex:row] objectForKey:@"areas"];
[self.areaPicker selectRow:0 inComponent:2 animated:YES];
[self.areaPicker reloadComponent:2];
self.locate.city = [[cities objectAtIndex:row] objectForKey:@"city"];
if ([areas count] > 0) {
self.locate.district = [areas objectAtIndex:0];
} else{
self.locate.district = @"";
}
break;
case 2:
if ([areas count] > 0) {
self.locate.district = [areas objectAtIndex:row];
} else{
self.locate.district = @"";
}
break;
default:
break;
}
//选中块
self.chooseBlock(self);
}
- (void)showInView:(UIView *)view
{
CGFloat width = [UIScreen mainScreen].applicationFrame.size.width;
CGFloat height = [UIScreen mainScreen].applicationFrame.size.height;
self.frame = CGRectMake(0, height, width, self.frame.size.height);
[view addSubview:self];
[UIView animateWithDuration:0.3 animations:^{
self.frame = CGRectMake(0, height - self.frame.size.height, width, self.frame.size.height);
}];
}
- (void)cancelPicker
{
[UIView animateWithDuration:0.3
animations:^{
self.frame = CGRectMake(0, self.frame.origin.y+self.frame.size.height, self.frame.size.width, self.frame.size.height);
}
completion:^(BOOL finished){
[self removeFromSuperview];
}];
}
- (IBAction)clickCancelBtn:(UIBarButtonItem *)sender {
self.cancelBlock();
}
- (IBAction)clickOkBtn:(UIBarButtonItem *)sender {
self.okBlock();
}
@end
其实你浏览一下就知道使用和表一样的，确定行数确定列数，选定方法之类的。我这是自己用nib画了一个时举器
然后再控制器创建一个按钮做为调出时举器的按钮， .h
#import "ViewController.h"
#import "AreaPickerView.h"
@interface ViewController ()
- (IBAction)clickBtn:(UIButton *)sender;
//地址按钮
@property (weak, nonatomic) IBOutlet UIButton *areaBtn;
@property (strong, nonatomic) NSString *areaValue;
@property (strong, nonatomic) AreaPickerView *locatePicker;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self cancelLocatePicker];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (IBAction)clickBtn:(UIButton *)sender {
self.locatePicker = [[AreaPickerView alloc]
initWithArea];
//块的相关操作
__weak typeof(self)weakSelf = self;
self.locatePicker.chooseBlock= ^(AreaPickerView *area)
{
weakSelf.areaValue = [NSString stringWithFormat:@"%@ %@ %@", area.locate.state, area.locate.city, area.locate.district];
};
self.locatePicker.cancelBlock = ^()
{
[weakSelf cancelLocatePicker];
};
self.locatePicker.okBlock = ^()
{
if( (weakSelf.areaValue == nil) || [weakSelf.areaValue isEqualToString:@"北京 北京 通州"])
{
weakSelf.areaValue = @"北京 北京 通州";
}
[weakSelf.areaBtn
setTitle:weakSelf.areaValue
forState:UIControlStateNormal];
[weakSelf cancelLocatePicker];
};
[self.locatePicker showInView:self.view];
}
#pragma mark - HZAreaPicker delegate
-(void)pickerDidChaneStatus:(AreaPickerView *)picker
{
self.areaValue = [NSString stringWithFormat:@"%@ %@ %@", picker.locate.state, picker.locate.city, picker.locate.district];
NSLog(@"%@",self.areaValue);
}
-(void)cancelLocatePicker
{
[self.locatePicker cancelPicker];
self.locatePicker = nil;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesBegan:touches withEvent:event];
if( (self.areaValue == nil) || [self.areaValue isEqualToString:@"北京 北京 通州"])
{
self.areaValue = @"北京 北京 通州";
}
[self.areaBtn
setTitle:self.areaValue
forState:UIControlStateNormal];
[self cancelLocatePicker];
}
@end
这样，一个地区时举器就完成了
在这里面我是留了一个小bug的，不知道你们能不能看出来。看出来自己修改一下，相信自己的能力，很快就可以成功。